As the threats of climate change grow, the need to reduce carbon dioxide (CO₂) emissions from fossil fuel burning is increasingly acknowledged by governments around the world. The potential of carbon capture and storage (CCS), a set of technologies that offers a politically appealing vision of a ‘cleaner’ way to use fossil fuels, has provided powerful motivation for large public and private investments in CCS technology. But investing in CCS is controversial because, although some consider it a critical climate mitigation technology, others view it as an expensive fossil fuel subsidy that could inadvertently perpetuate, rather than reduce, fossil fuel reliance.